Goethe offers one free official modelltest directly on their website. This is the gold standard because it is identical in difficulty to the real exam.
Use the answer key (provided in most official PDFs). For writing and speaking, you need a teacher or a rubric. However, self-checking is possible:
After 1-2 weeks of targeted study, download another PDF (e.g., from ÖSD or Hueber). Repeat the simulation. Your score should improve.
Run through this checklist after completing your 3rd Modelltest PDF:
☑ I can finish the reading section in ≤60 minutes, not 65.
☑ I stay calm when the listening audio plays only once.
☑ My writing contains no verb-position errors (verb second in main clauses, verb last in subordinate clauses).
☑ I can speak for 3+ minutes on a random B2 topic (e.g., “Home office vs. office”) without long pauses.
☑ My average score across 2 different model tests is ≥70% (passing is 60%, but aim higher).
If all boxes are checked, book your official Goethe exam. If not, download one more Modelltest PDF and repeat the process.